Find the surface area of a sphere of radius 21 cm. (Take \(\pi = \frac{22}{7}\).)

A. 1386 cm²

B. 5544 cm²

C. 2772 cm²

D. 38808 cm²

Doubtly AI Asked 27 Oct 2026 AI-generated · not yet verified ssc cpo Save WhatsApp Report

1 answer

Best answer

Answer: B. 5544 cm²

Answer: (B) 5544 cm²

Surface area \(= 4\pi r^2 = 4 \times \frac{22}{7} \times 441 = 5544\) cm². (1386 is \(\pi r^2\); 38808 is the volume.)

Doubtly AI · 27 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?